report healthz API endpoint

[sunya-ch]

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multi-nic-cni should report any error such as failure on update/create resource (e.g., found in https://github.com/foundation-model-stack/multi-nic-cni/issues/113) via the healthz API endpoint.

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[sunya-ch]

WIP: https://github.com/sunya-ch/multi-nic-cni/commit/4cce4ef336a98bd77de02b682513a176cf0b7f04

[sunya-ch]

should be supported by https://github.com/foundation-model-stack/multi-nic-cni/pull/119